At the Lower Arroyo Seco, what are the secondary channels away from the main concrete channel? (mark all that apply).
1 a result of restoration efforts by the City
2 these are replacements for what would be naturally occurring meanders of the river
3 these side streams create riparian habitat and shaded trails by diverting water from the concrete channel
4 these streams support Mulefat and Willow Scrub and Alluvial Fan scrub plant communities